0
L = length of coil
D = diameter of coil
N = number of turns
P = pitch
L^2 = (pi*D*N)^2 + (P*N)^2
using AUTOCAD
make sure view mode in isometric
- type command HELIX
- input base diameter
- input top diameter
- right click mouse, select turn height
- input turn height (pitch)
- input height of coil
you can see length of coil by clicking picture twice to see length in property of helix
the different result between formula above and using autocad is 0.23 %
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lengthofspiralring
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